numpy 辨异(二) —— np identity /np eye

                       
 

import numpy as np;

  • 两者在创建单位矩阵上,并无区别,两者的区别主要在接口上;

  • np.identity(n, dtype=None):只能获取方阵,也即标准意义的单位阵;

  • np.eye(N, M=None, k=0, dtype=<type ‘float’>);

    • N : int,Number of rows in the output.(行数,必选)

    • M : int, optional,Number of columns in the output. If None, defaults to N.()

    • k : int, optional,Index of the diagonal: 0 (the default) refers to the main diagonal,
      • a positive value refers to an upper diagonal,
      • and a negative value to a lower diagonal.
           

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